单项选择题

Among" humanity's current problems" (Line 2, Para. 2), the chief concern of the scientists is______.

A．the impoverishment of developing countries
B．the explosion of the human population
C．the reduction of biological diversity
D．the effect of global warming
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单项选择题
According to the passage, cutting trees to grow more food______.
A．will widen the gap between the developed and the developing countries
B．is but a short-term relief to the food problem
C．can hardly alleviate the shortage of food
D．proves to be an effective way for impoverished nations
单项选择题
The author's purpose in writing this passage is______.
A．to describe the difficulties in solving humanity's current problems
B．to present the different views on humanity's current problems
C．to analyze the contradiction between countries in dealing with humanity's current problems
D．to point out that humanity's current problems can only be solved through the cooperation of nations
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